The Supreme Court’s remarkably speedy decision Friday to allow a controversial ban on TikTok to take hold will have a dramatic impact on the tens of millions of Americans who visit the app every day and broad political implications for President-elect Donald Trump.

Now that TikTok has finally reached the end of its legal options in the US to avoid a ban, somehow, its future seems less clear than ever. The Supreme Court couldn’t have been more direct: the Protecting Americans from Foreign Adversary Controlled Applications Act,

The app had more than 170 million monthly users in the U.S. The black-out is the result of a law forcing the service offline unless it sheds its ties to ByteDance, its China-based parent company.